Toric Contact Lens Digital Performance and Comfort Study

Not Applicable

Completed

Brief Summary: This study seeks to quantify digital visual performance and subjective visual acceptance of toric contact lenses as compared to spherical lenses in low to moderate astigmatic patients.

Detailed Description: This study seeks to quantify the near visual performance and subjective visual acceptance of toric contact lenses as compared to spherical lenses in an astigmatic cohort of patients. Primary Hypotheses: Subjects will have better near visual acuity and near visual performance with toric, as opposed to spherical, contact lens correction. As such, the following hypotheses will be tested: H01: There is no statistically significant difference in near visual acuity or near vision performance between contact lenses corrections Ha1: There is a statistically significant difference in visual acuity or vision performance between contact lenses corrections

Recruitment & Eligibility

Inclusion Criteria

18 to 39 years of age (inclusive)
pl to -6.00D vertexed sphere power and -0.75 to -1.50D vertexed refractive cylinder OD and OS
Current/established full time (>6 days week, >8 hours/day) soft contact lens wearer
Best corrected acuity of 20/25 or better in each eye
Self-report of at least 4 hrs/day using digital devices
Willing to wear lenses at least 8 hours each day during the study period
Able to speak and read English at a high school level / have at least a high school diploma or equivalent (by self-report)

Enclusion Criteria:

History of ocular pathology or surgery
Binocular vision disorder (i.e., tropia, convergence or accommodative insufficiency)
Gas permeable lens wear for at least 3 months
Symptomatic soft contact lens wearer (CLDEQ-8 score <12 at baseline)

Exclusion Criteria

Not provided

Arm && Interventions

Group	Intervention	Description
Sphere, Then Toric	Precision1 Sphere	Participants who received Spherical contact lenses first and Toric lenses after 10 days
Toric, Then Sphere	Precision1 for Astigmatism	Participants who received Toric contact lenses first and spherical lenses after 10 days
Sphere, Then Toric	Precision1 for Astigmatism	Participants who received Spherical contact lenses first and Toric lenses after 10 days
Toric, Then Sphere	Precision1 Sphere	Participants who received Toric contact lenses first and spherical lenses after 10 days

Primary Outcome Measures

Name	Time	Method
Near Visual LogMAR Acuity	10 +/- 2 days	High contrast LogMAR visual acuity was assessed at 40 cm using the M\&S Clinical Trial Suite system (Niles, Illinois, USA). The system was calibrated according to the manufacturer's directions every day, prior to use. Testing was performed binocularly 10+/-2 days after each intervention. The test started at 20/60 and continued until three letters were missed on a line.
Dynamic Visual Acuity	10 +/- 2 days	Dynamic VA was determined using a custom-made iPad application. The subject was instructed to hold the iPad at 40cm and presented with a Landolt C surrounded by crowding bars for 0.3s each, starting from 0.5 LogMAR and progressing to smaller sizes using a staircase threshold method. Testing was performed binocularly 10+/-2 days after each intervention

Secondary Outcome Measures